定语从句的关联词基本与三种名词性从句的关联词相同,除what只能引导名词性从句,即(主语从句、表语从句和宾语从句)合称为名词性从句之外。注意定语从句需位于被修饰的名或代词之后,如;I know the man who is standing there.宾语从句则直接承受主句的谓语行为,如,I know who is standing there.注意,这也是为什么主格who经常可以换用宾格whom的原因,但介词之后的whom不可换用who,因为介词有及物的动态理念!I know what you want.(宾语从句)比较;I know the thing that you want.(定语从句)
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